> Of course, these days I would seriously suggest against trying to
quoted text
> optimize the kmap() case. It only matters on crap hardware these days.
> Anybody running HIGHMEM in 2010 and thinks that it makes sense
> deserves the pain the get. We should not complicate the kernel further
> for it, and sane architectures will have a no-op kmap().

Well, keep in mind most even vaguely recent 32-bit x86 distro kernels
have HIGHMEM4G enabled by default.
Some recent ones even have HIGHMEM64G enabled in order to get NX support.
(And yes, as I said before, there are many processors that cannot run in long mode
but have NX)

Yuhong Bao
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